7 On the first day hold a sacred assembly and do no regular work.

Read Leviticus 23:7 Using Other Translations

In the first day ye shall have an holy convocation: ye shall do no servile work therein.
On the first day you shall have a holy convocation; you shall not do any ordinary work.
On the first day of the festival, all the people must stop their ordinary work and observe an official day for holy assembly.